Picosecond measurements of exciton migration in tetracene crystals doped with pentacene |
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| Authors: | A.J. Campillo S.L. Shapiro C.E. Swenberg |
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| Affiliation: | University of California, Los Alamos Scientific Laboratory, Los Alamos, New Mexico 87545, USA;Radiation and Solid State Laboratory, New York University, New York, New York 10003, USA |
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| Abstract: | The kinetics of electronic energy transfer from host to guest have been measured for a tetracene crystal doped with pentacene. With single picosecond pulse excitation and streak camera diagnostics, the fluorescence risetime of the guest is measured to be the same as the decay time of the host. For low pentacene concentrations the exponential decay of the host at 170 K is consistent with a diffusion model for singlet migration from host to guest. At high intensities, no evidence was found for guest saturation because of the dominating effect of bimolecular exciton annihilation in the host. |
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